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Texas Instruments ADS7817E/2K5
- Part No.:
- ADS7817E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817E/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,341
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Product details
Overview
ADS7817E/2K5 from Texas Instruments is a 12-bit, 200kHz sampling SAR analog-to-digital converter with fully differential high-impedance inputs, 2.3mW power consumption at full rate, 3µA shutdown current, and MSOP-8 package - designed for precision transducer interfacing in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817E/2K5 datasheet, ADS7817E/2K5 pinout, ADS7817E/2K5 application, or ADS7817E/2K5 equivalent, key selection considerations include its differential input architecture, reference voltage scalability (100mV–2.5V), serial CMOS interface timing, and MSOP-8 thermal performance in low-power embedded signal chains.
Technical Context
The ADS7817E/2K5 implements a capacitive redistribution SAR architecture on 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external reference (100mV–2.5V) and asynchronous DCLOCK (10kHz–3.2MHz), with conversion initiated by CS/SHDN falling edge and serial output (MSB-first, two's complement) on DOUT synchronized to DCLOCK falling edges.
Its analog input supports true bipolar differential operation (+In/–In), enabling common-mode rejection >80dB and AC-coupled signal acquisition. Power management includes automatic post-conversion power-down and full shutdown when CS = VCC, reducing supply current from 800µA (active, 200kHz) to 3µA (shutdown).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - delivers 12-bit monotonicity across full temperature range (–40°C to +85°C). |
| Sampling Rate | 200kHz maximum throughput - enables real-time monitoring of signals up to ~80kHz (Nyquist-limited) without aliasing in anti-aliased designs. |
| Input Type | Fully differential, high-impedance (≥1GΩ in hold mode) - accepts ±VREF span with 15pF input capacitance, requiring matched source impedance for <±2 LSB linearity error. |
| Reference Range | 100mV to 2.5V externally supplied - sets LSB size from 49µV (100mV ref) to 1.22mV (2.5V ref); ENOB drops from ~9.5 bits (2.5V) to ~7.2 bits (100mV). |
| Power Consumption | 2.3mW at 200kHz (5V supply), 3µA shutdown - enables multi-year battery life in wake-on-event sensor nodes with short-cycle conversions. |
| Interface | 3-wire synchronous serial (CS/SHDN, DCLOCK, DOUT), CMOS-compatible levels - eliminates need for level-shifting in 3.3V/5V microcontroller systems. |
| INL / DNL | ±2 LSB integral linearity, ±2 LSB differential linearity (E-grade) - ensures accurate representation of linear transducer outputs (e.g., strain gauges, RTDs) without calibration over temperature. |
Pinout & Package
ADS7817E/2K5 is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm body, 0.65mm pitch), optimized for space-constrained PCB layouts and thermal performance in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | External reference voltage input | Sets full-scale analog input range (±VREF); draws 1.3–25µA depending on code and sample rate - requires low-noise, well-bypassed source (0.1µF ceramic). |
| +In (Pin 2) | Non-inverting analog input | Accepts voltage from –0.3V to VCC+0.3V; forms differential pair with –In; input leakage ≤±1µA - must match –In source impedance to minimize gain/offset drift. |
| –In (Pin 3) | Inverting analog input | Accepts voltage from –0.3V to 4V; completes true differential input path; common-mode range scales with VREF - enables rejection of noise coupled equally to both inputs. |
| GND (Pin 4) | Analog ground reference | Single-point connection to clean analog ground plane; isolation from digital ground prevents coupling of switching noise into conversion result. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full shutdown (3µA ICC); timing-critical setup/hold vs DCLOCK defines sampling window start. |
| DOUT (Pin 6) | Serial data output | Three-state CMOS output; drives MSB-first two's complement word after null bit; valid on DCLOCK falling edge - compatible with SPI master clock polarity CPOL=0, CPHA=1. |
| DCLOCK (Pin 7) | Data clock input | Asynchronous clock (10kHz–3.2MHz); minimum high/low time ≥150ns; controls conversion speed and serial bit rate - no duty cycle constraint required. |
| +VCC (Pin 8) | Positive supply | 4.75V–5.25V operation; supplies analog and digital sections; bypass with 0.1µF ceramic capacitor placed <2mm from pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Enables >80dB AC common-mode rejection and direct connection to bridge sensors without instrumentation amplifiers. |
| Micro-power operation at full speed | 2.3mW (5V, 200kHz) allows continuous sampling in energy-harvesting or coin-cell-powered nodes without thermal derating. |
| Scalable reference voltage (100mV–2.5V) | Permits optimization of dynamic range vs resolution: e.g., 100mV ref for µV-level thermocouple signals, 2.5V ref for industrial 0–5V sensors. |
| Short-cycle conversion capability | Allows early termination of serial output after n bits (n < 12) via CS HIGH - reduces average power in threshold-detection applications (e.g., overvoltage alarms). |
| MSOP-8 thermal and layout efficiency | Low thermal resistance (θJA ≈ 200°C/W) and small footprint support high-density mixed-signal PCBs with minimal ground contamination risk. |
Applications
| Transducer Interface | Battery Operated Systems |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from load cells, pressure sensors, or thermopiles in handheld test equipment. IC Role / Device Role / Timing Role: Precision front-end ADC acquiring differential sensor voltage with 12-bit resolution and 200kHz burst capability. Use Value: Eliminates external op-amp gain stages and associated offset drift, reducing BOM count and calibration complexity while maintaining ±2 LSB linearity. | Use Scenario: Continuous voltage/current monitoring in wireless sensor nodes powered by CR2032 batteries with 5-year target lifetime. IC Role / Device Role / Timing Role: Low-quiescent ADC performing periodic 12-bit conversions with automatic power-down between samples. Use Value: 3µA shutdown current and short-cycle capability enable sub-µA average system current during sleep, extending battery life beyond 60 months. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Distributed environmental monitoring across 100m cable runs using RS-485 backhaul and local analog sensing. IC Role / Device Role / Timing Role: Local SAR ADC converting sensor signals before digital isolation and transmission. Use Value: Differential input rejects common-mode noise induced on long cables; 200kHz sampling supports oversampling for enhanced effective resolution. | Use Scenario: High-voltage motor phase current sensing where ADC must be galvanically isolated from controller logic. IC Role / Device Role / Timing Role: Isolated-side ADC feeding isolated SPI interface to microcontroller across capacitive or magnetic barrier. Use Value: MSOP-8 package fits compact isolated PCB sections; low EMI emissions simplify compliance with IEC 61000-4-5 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816E/2K5 | 12-bit, 100kHz max sampling rate; identical MSOP-8 package and pinout; lower power (1.1mW @ 100kHz) but half throughput. | Best suited for lower-bandwidth sensor monitoring where 200kHz is unnecessary - reduces clocking complexity and EMI. | Select ADS7817E/2K5 when >100kHz sampling is required; choose ADS7816E/2K5 for ultra-low-power static measurements. |
| ADS8325IPW | 16-bit, 100kSPS SAR ADC in TSSOP-16; higher resolution but larger package, higher power (12mW), and no shutdown mode below 10µA. | Applicable where 16-bit resolution justifies cost, size, and power penalty - e.g., precision calibration equipment. | ADS7817E/2K5 remains optimal for 12-bit, space-constrained, battery-sensitive designs; ADS8325IPW suits lab-grade accuracy needs. |
Compared with ADS7816E/2K5, ADS7817E/2K5 delivers double the sampling rate in the same footprint and power envelope; versus ADS8325IPW, it trades resolution for 5× lower power, 40% smaller package, and integrated shutdown - making it superior for portable, real-time embedded sensing.
Availability
ADS7817E/2K5 is available at Aetrix Electronics and suitable for transducer interface, battery-operated systems, and remote data acquisition requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for ADS7817E/2K5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power design.
The ADS7817E/2K5 belongs to TI's legacy precision SAR ADC product line, engineered specifically for high-fidelity, low-power signal acquisition in portable and distributed measurement systems.
FAQ
What is the absolute maximum input voltage range for ADS7817E/2K5?
The ADS7817E/2K5 specifies absolute maximum analog input voltages of –0.3V to VCC+0.3V on +In and –0.3V to 4V on –In. Exceeding these limits risks permanent damage. For reliable operation within specifications, keep +In and –In within GND to VCC, with differential span limited to ±VREF (e.g., ±2.5V max with 2.5V reference). The ADS7817E/2K5 datasheet confirms these ratings in Section "Absolute Maximum Ratings".
Does ADS7817E/2K5 support single-ended input configurations?
Yes, ADS7817E/2K5 supports single-ended operation by holding –In at a fixed common-mode voltage (e.g., VREF/2) while driving +In with the signal. However, this reduces common-mode rejection and requires careful impedance matching to avoid gain/offset errors. The ADS7817E/2K5 datasheet explicitly describes this method in the "Analog Input" section and notes that differential mode delivers superior performance.
What is the minimum clock frequency required for ADS7817E/2K5 to operate correctly?
The ADS7817E/2K5 requires a minimum DCLOCK frequency of 10kHz to maintain internal capacitor charge integrity - corresponding to a 625Hz throughput rate. Below this, leakage may cause linearity degradation. This value is specified in the "Timing Characteristics" table and confirmed in the "Theory of Operation" section of the ADS7817E/2K5 datasheet.
How does reference voltage selection affect effective resolution of ADS7817E/2K5?
Lowering the ADS7817E/2K5 reference voltage (e.g., from 2.5V to 100mV) reduces LSB size from 1.22mV to 49µV but degrades effective number of bits (ENOB) from ~11.5 to ~7.2 due to fixed internal noise. The ADS7817E/2K5 "Effective Number of Bits vs Reference Voltage" plot quantifies this trade-off, confirming that resolution gain is offset by increased noise sensitivity.
Can ADS7817E/2K5 be used with a 3.3V microcontroller SPI interface?
Yes, ADS7817E/2K5 supports 3.3V logic levels: VIH(min) = 3V and VOL(max) = 0.4V at IOL = 250µA, ensuring compatibility with standard 3.3V CMOS interfaces. Its DOUT output is three-state and DCLOCK/CS inputs meet 3.3V thresholds - no level-shifting required. This interoperability is verified in the "Digital Input/Output" section of the ADS7817E/2K5 datasheet.
ADS7817E/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7817E/2K5 FAQ
1.How can I place an order for ADS7817E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817E/2K5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7817E/2K5 reliable?
The price and inventory of ADS7817E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7817E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817E/2K5?
ADS7817E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817E/2K5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7817E/2K5?
For technical support, including ADS7817E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817E/2K5 requirements.
6.How does Aetrix verify that ADS7817E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7817E/2K5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7817E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7817E/2K5?
All ADS7817E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817E/2K5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7817E/2K5 part is unused and in its original packaging.
Return procedure for ADS7817E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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